<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <!-- 只能由回车触发 -->
      <input type="text" @keyup.enter="fn" />
      <hr>
      <input type="text" @keyup.a="fn" />
      <hr>
      <input type="text" @keyup.space="fn" />
    </div>
    <script src="./vue.js"></script>
    <script>
      new Vue({
        el: '#app',
        data () {
          return {}
        },
        methods: {
          fn (e) {
            console.log('....')
          }
        }
      })
    </script>
  </body>
</html>
